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authorPeter Maydell <peter.maydell@linaro.org>2014-08-07 14:54:47 +0100
committerPeter Maydell <peter.maydell@linaro.org>2014-08-07 14:54:47 +0100
commit2ee55b8351910e5dd898f52415064a4c5479baba (patch)
tree7d29652c004379d94056ed5caa046c768af8f2ab
parent9d8bb3557408adc3e5e26b7915cbf6c198dfd4ff (diff)
parenteddedd546a68f6ac864b71d50dd8d39b939b724b (diff)
downloadqemu-arm-2ee55b8351910e5dd898f52415064a4c5479baba.tar.gz
Merge remote-tracking branch 'remotes/bonzini/tags/for-upstream' into staging
KVM changes include a MIPS patch and the testdev backend used by the ARM kvm-unit-tests. icount include the first part of reverse execution and Sebastian Tanase's patches to slow down -icount execution to the desired speed of the target. v1->v2: fix dump_drift_info to print nothing outside icount mode, and to compile on 32-bit architectures # gpg: Signature made Thu 07 Aug 2014 14:09:58 BST using RSA key ID 9B4D86F2 # gpg: Good signature from "Paolo Bonzini <pbonzini@redhat.com>" # gpg: aka "Paolo Bonzini <bonzini@gnu.org>" * remotes/bonzini/tags/for-upstream: target-mips: Ignore unassigned accesses with KVM monitor: Add drift info to 'info jit' cpu-exec: Print to console if the guest is late cpu-exec: Add sleeping algorithm icount: Add align option to icount icount: Add QemuOpts for icount icount: Fix virtual clock start value on ARM timer: add cpu_icount_to_ns function. migration: migrate icount fields. icount: put icount variables into TimerState. backends: Introduce chr-testdev Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
-rw-r--r--backends/Makefile.objs2
-rw-r--r--backends/testdev.c131
-rw-r--r--cpu-exec.c116
-rw-r--r--cpus.c118
-rw-r--r--include/qemu-common.h8
-rw-r--r--include/qemu/timer.h2
-rw-r--r--include/sysemu/char.h3
-rw-r--r--monitor.c1
-rw-r--r--qapi-schema.json3
-rw-r--r--qemu-char.c4
-rw-r--r--qemu-options.hx17
-rw-r--r--qtest.c13
-rw-r--r--stubs/Makefile.objs1
-rw-r--r--stubs/chr-testdev.c7
-rw-r--r--target-mips/op_helper.c11
-rw-r--r--vl.c39
16 files changed, 444 insertions, 32 deletions
diff --git a/backends/Makefile.objs b/backends/Makefile.objs
index 506a46c33b..31a3a894f5 100644
--- a/backends/Makefile.objs
+++ b/backends/Makefile.objs
@@ -1,7 +1,7 @@
common-obj-y += rng.o rng-egd.o
common-obj-$(CONFIG_POSIX) += rng-random.o
-common-obj-y += msmouse.o
+common-obj-y += msmouse.o testdev.o
common-obj-$(CONFIG_BRLAPI) += baum.o
baum.o-cflags := $(SDL_CFLAGS)
diff --git a/backends/testdev.c b/backends/testdev.c
new file mode 100644
index 0000000000..70d63b3b8d
--- /dev/null
+++ b/backends/testdev.c
@@ -0,0 +1,131 @@
+/*
+ * QEMU Char Device for testsuite control
+ *
+ * Copyright (c) 2014 Red Hat, Inc.
+ *
+ * Author: Paolo Bonzini <pbonzini@redhat.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "qemu-common.h"
+#include "sysemu/char.h"
+
+#define BUF_SIZE 32
+
+typedef struct {
+ CharDriverState *chr;
+ uint8_t in_buf[32];
+ int in_buf_used;
+} TestdevCharState;
+
+/* Try to interpret a whole incoming packet */
+static int testdev_eat_packet(TestdevCharState *testdev)
+{
+ const uint8_t *cur = testdev->in_buf;
+ int len = testdev->in_buf_used;
+ uint8_t c;
+ int arg;
+
+#define EAT(c) do { \
+ if (!len--) { \
+ return 0; \
+ } \
+ c = *cur++; \
+} while (0)
+
+ EAT(c);
+
+ while (isspace(c)) {
+ EAT(c);
+ }
+
+ arg = 0;
+ while (isdigit(c)) {
+ arg = arg * 10 + c - '0';
+ EAT(c);
+ }
+
+ while (isspace(c)) {
+ EAT(c);
+ }
+
+ switch (c) {
+ case 'q':
+ exit((arg << 1) | 1);
+ break;
+ default:
+ break;
+ }
+ return cur - testdev->in_buf;
+}
+
+/* The other end is writing some data. Store it and try to interpret */
+static int testdev_write(CharDriverState *chr, const uint8_t *buf, int len)
+{
+ TestdevCharState *testdev = chr->opaque;
+ int tocopy, eaten, orig_len = len;
+
+ while (len) {
+ /* Complete our buffer as much as possible */
+ tocopy = MIN(len, BUF_SIZE - testdev->in_buf_used);
+
+ memcpy(testdev->in_buf + testdev->in_buf_used, buf, tocopy);
+ testdev->in_buf_used += tocopy;
+ buf += tocopy;
+ len -= tocopy;
+
+ /* Interpret it as much as possible */
+ while (testdev->in_buf_used > 0 &&
+ (eaten = testdev_eat_packet(testdev)) > 0) {
+ memmove(testdev->in_buf, testdev->in_buf + eaten,
+ testdev->in_buf_used - eaten);
+ testdev->in_buf_used -= eaten;
+ }
+ }
+ return orig_len;
+}
+
+static void testdev_close(struct CharDriverState *chr)
+{
+ TestdevCharState *testdev = chr->opaque;
+
+ g_free(testdev);
+}
+
+CharDriverState *chr_testdev_init(void)
+{
+ TestdevCharState *testdev;
+ CharDriverState *chr;
+
+ testdev = g_malloc0(sizeof(TestdevCharState));
+ testdev->chr = chr = g_malloc0(sizeof(CharDriverState));
+
+ chr->opaque = testdev;
+ chr->chr_write = testdev_write;
+ chr->chr_close = testdev_close;
+
+ return chr;
+}
+
+static void register_types(void)
+{
+ register_char_driver_qapi("testdev", CHARDEV_BACKEND_KIND_TESTDEV, NULL);
+}
+
+type_init(register_types);
diff --git a/cpu-exec.c b/cpu-exec.c
index 38e5f02a30..cbc8067b37 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -22,6 +22,109 @@
#include "tcg.h"
#include "qemu/atomic.h"
#include "sysemu/qtest.h"
+#include "qemu/timer.h"
+
+/* -icount align implementation. */
+
+typedef struct SyncClocks {
+ int64_t diff_clk;
+ int64_t last_cpu_icount;
+ int64_t realtime_clock;
+} SyncClocks;
+
+#if !defined(CONFIG_USER_ONLY)
+/* Allow the guest to have a max 3ms advance.
+ * The difference between the 2 clocks could therefore
+ * oscillate around 0.
+ */
+#define VM_CLOCK_ADVANCE 3000000
+#define THRESHOLD_REDUCE 1.5
+#define MAX_DELAY_PRINT_RATE 2000000000LL
+#define MAX_NB_PRINTS 100
+
+static void align_clocks(SyncClocks *sc, const CPUState *cpu)
+{
+ int64_t cpu_icount;
+
+ if (!icount_align_option) {
+ return;
+ }
+
+ cpu_icount = cpu->icount_extra + cpu->icount_decr.u16.low;
+ sc->diff_clk += cpu_icount_to_ns(sc->last_cpu_icount - cpu_icount);
+ sc->last_cpu_icount = cpu_icount;
+
+ if (sc->diff_clk > VM_CLOCK_ADVANCE) {
+#ifndef _WIN32
+ struct timespec sleep_delay, rem_delay;
+ sleep_delay.tv_sec = sc->diff_clk / 1000000000LL;
+ sleep_delay.tv_nsec = sc->diff_clk % 1000000000LL;
+ if (nanosleep(&sleep_delay, &rem_delay) < 0) {
+ sc->diff_clk -= (sleep_delay.tv_sec - rem_delay.tv_sec) * 1000000000LL;
+ sc->diff_clk -= sleep_delay.tv_nsec - rem_delay.tv_nsec;
+ } else {
+ sc->diff_clk = 0;
+ }
+#else
+ Sleep(sc->diff_clk / SCALE_MS);
+ sc->diff_clk = 0;
+#endif
+ }
+}
+
+static void print_delay(const SyncClocks *sc)
+{
+ static float threshold_delay;
+ static int64_t last_realtime_clock;
+ static int nb_prints;
+
+ if (icount_align_option &&
+ sc->realtime_clock - last_realtime_clock >= MAX_DELAY_PRINT_RATE &&
+ nb_prints < MAX_NB_PRINTS) {
+ if ((-sc->diff_clk / (float)1000000000LL > threshold_delay) ||
+ (-sc->diff_clk / (float)1000000000LL <
+ (threshold_delay - THRESHOLD_REDUCE))) {
+ threshold_delay = (-sc->diff_clk / 1000000000LL) + 1;
+ printf("Warning: The guest is now late by %.1f to %.1f seconds\n",
+ threshold_delay - 1,
+ threshold_delay);
+ nb_prints++;
+ last_realtime_clock = sc->realtime_clock;
+ }
+ }
+}
+
+static void init_delay_params(SyncClocks *sc,
+ const CPUState *cpu)
+{
+ if (!icount_align_option) {
+ return;
+ }
+ sc->realtime_clock = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
+ sc->diff_clk = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) -
+ sc->realtime_clock +
+ cpu_get_clock_offset();
+ sc->last_cpu_icount = cpu->icount_extra + cpu->icount_decr.u16.low;
+ if (sc->diff_clk < max_delay) {
+ max_delay = sc->diff_clk;
+ }
+ if (sc->diff_clk > max_advance) {
+ max_advance = sc->diff_clk;
+ }
+
+ /* Print every 2s max if the guest is late. We limit the number
+ of printed messages to NB_PRINT_MAX(currently 100) */
+ print_delay(sc);
+}
+#else
+static void align_clocks(SyncClocks *sc, const CPUState *cpu)
+{
+}
+
+static void init_delay_params(SyncClocks *sc, const CPUState *cpu)
+{
+}
+#endif /* CONFIG USER ONLY */
void cpu_loop_exit(CPUState *cpu)
{
@@ -227,6 +330,8 @@ int cpu_exec(CPUArchState *env)
TranslationBlock *tb;
uint8_t *tc_ptr;
uintptr_t next_tb;
+ SyncClocks sc;
+
/* This must be volatile so it is not trashed by longjmp() */
volatile bool have_tb_lock = false;
@@ -283,6 +388,13 @@ int cpu_exec(CPUArchState *env)
#endif
cpu->exception_index = -1;
+ /* Calculate difference between guest clock and host clock.
+ * This delay includes the delay of the last cycle, so
+ * what we have to do is sleep until it is 0. As for the
+ * advance/delay we gain here, we try to fix it next time.
+ */
+ init_delay_params(&sc, cpu);
+
/* prepare setjmp context for exception handling */
for(;;) {
if (sigsetjmp(cpu->jmp_env, 0) == 0) {
@@ -672,6 +784,7 @@ int cpu_exec(CPUArchState *env)
if (insns_left > 0) {
/* Execute remaining instructions. */
cpu_exec_nocache(env, insns_left, tb);
+ align_clocks(&sc, cpu);
}
cpu->exception_index = EXCP_INTERRUPT;
next_tb = 0;
@@ -684,6 +797,9 @@ int cpu_exec(CPUArchState *env)
}
}
cpu->current_tb = NULL;
+ /* Try to align the host and virtual clocks
+ if the guest is in advance */
+ align_clocks(&sc, cpu);
/* reset soft MMU for next block (it can currently
only be set by a memory fault) */
} /* for(;;) */
diff --git a/cpus.c b/cpus.c
index 5e7f2cf3cf..2b5c0bd7c7 100644
--- a/cpus.c
+++ b/cpus.c
@@ -64,6 +64,8 @@
#endif /* CONFIG_LINUX */
static CPUState *next_cpu;
+int64_t max_delay;
+int64_t max_advance;
bool cpu_is_stopped(CPUState *cpu)
{
@@ -102,17 +104,12 @@ static bool all_cpu_threads_idle(void)
/* Protected by TimersState seqlock */
-/* Compensate for varying guest execution speed. */
-static int64_t qemu_icount_bias;
-static int64_t vm_clock_warp_start;
+static int64_t vm_clock_warp_start = -1;
/* Conversion factor from emulated instructions to virtual clock ticks. */
static int icount_time_shift;
/* Arbitrarily pick 1MIPS as the minimum allowable speed. */
#define MAX_ICOUNT_SHIFT 10
-/* Only written by TCG thread */
-static int64_t qemu_icount;
-
static QEMUTimer *icount_rt_timer;
static QEMUTimer *icount_vm_timer;
static QEMUTimer *icount_warp_timer;
@@ -129,6 +126,11 @@ typedef struct TimersState {
int64_t cpu_clock_offset;
int32_t cpu_ticks_enabled;
int64_t dummy;
+
+ /* Compensate for varying guest execution speed. */
+ int64_t qemu_icount_bias;
+ /* Only written by TCG thread */
+ int64_t qemu_icount;
} TimersState;
static TimersState timers_state;
@@ -139,14 +141,14 @@ static int64_t cpu_get_icount_locked(void)
int64_t icount;
CPUState *cpu = current_cpu;
- icount = qemu_icount;
+ icount = timers_state.qemu_icount;
if (cpu) {
if (!cpu_can_do_io(cpu)) {
fprintf(stderr, "Bad clock read\n");
}
icount -= (cpu->icount_decr.u16.low + cpu->icount_extra);
}
- return qemu_icount_bias + (icount << icount_time_shift);
+ return timers_state.qemu_icount_bias + cpu_icount_to_ns(icount);
}
int64_t cpu_get_icount(void)
@@ -162,6 +164,11 @@ int64_t cpu_get_icount(void)
return icount;
}
+int64_t cpu_icount_to_ns(int64_t icount)
+{
+ return icount << icount_time_shift;
+}
+
/* return the host CPU cycle counter and handle stop/restart */
/* Caller must hold the BQL */
int64_t cpu_get_ticks(void)
@@ -214,6 +221,23 @@ int64_t cpu_get_clock(void)
return ti;
}
+/* return the offset between the host clock and virtual CPU clock */
+int64_t cpu_get_clock_offset(void)
+{
+ int64_t ti;
+ unsigned start;
+
+ do {
+ start = seqlock_read_begin(&timers_state.vm_clock_seqlock);
+ ti = timers_state.cpu_clock_offset;
+ if (!timers_state.cpu_ticks_enabled) {
+ ti -= get_clock();
+ }
+ } while (seqlock_read_retry(&timers_state.vm_clock_seqlock, start));
+
+ return -ti;
+}
+
/* enable cpu_get_ticks()
* Caller must hold BQL which server as mutex for vm_clock_seqlock.
*/
@@ -284,7 +308,8 @@ static void icount_adjust(void)
icount_time_shift++;
}
last_delta = delta;
- qemu_icount_bias = cur_icount - (qemu_icount << icount_time_shift);
+ timers_state.qemu_icount_bias = cur_icount
+ - (timers_state.qemu_icount << icount_time_shift);
seqlock_write_unlock(&timers_state.vm_clock_seqlock);
}
@@ -333,7 +358,7 @@ static void icount_warp_rt(void *opaque)
int64_t delta = cur_time - cur_icount;
warp_delta = MIN(warp_delta, delta);
}
- qemu_icount_bias += warp_delta;
+ timers_state.qemu_icount_bias += warp_delta;
}
vm_clock_warp_start = -1;
seqlock_write_unlock(&timers_state.vm_clock_seqlock);
@@ -351,7 +376,7 @@ void qtest_clock_warp(int64_t dest)
int64_t deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL);
int64_t warp = qemu_soonest_timeout(dest - clock, deadline);
seqlock_write_lock(&timers_state.vm_clock_seqlock);
- qemu_icount_bias += warp;
+ timers_state.qemu_icount_bias += warp;
seqlock_write_unlock(&timers_state.vm_clock_seqlock);
qemu_clock_run_timers(QEMU_CLOCK_VIRTUAL);
@@ -428,6 +453,25 @@ void qemu_clock_warp(QEMUClockType type)
}
}
+static bool icount_state_needed(void *opaque)
+{
+ return use_icount;
+}
+
+/*
+ * This is a subsection for icount migration.
+ */
+static const VMStateDescription icount_vmstate_timers = {
+ .name = "timer/icount",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .fields = (VMStateField[]) {
+ VMSTATE_INT64(qemu_icount_bias, TimersState),
+ VMSTATE_INT64(qemu_icount, TimersState),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
static const VMStateDescription vmstate_timers = {
.name = "timer",
.version_id = 2,
@@ -437,23 +481,44 @@ static const VMStateDescription vmstate_timers = {
VMSTATE_INT64(dummy, TimersState),
VMSTATE_INT64_V(cpu_clock_offset, TimersState, 2),
VMSTATE_END_OF_LIST()
+ },
+ .subsections = (VMStateSubsection[]) {
+ {
+ .vmsd = &icount_vmstate_timers,
+ .needed = icount_state_needed,
+ }, {
+ /* empty */
+ }
}
};
-void configure_icount(const char *option)
+void configure_icount(QemuOpts *opts, Error **errp)
{
+ const char *option;
+ char *rem_str = NULL;
+
seqlock_init(&timers_state.vm_clock_seqlock, NULL);
vmstate_register(NULL, 0, &vmstate_timers, &timers_state);
+ option = qemu_opt_get(opts, "shift");
if (!option) {
+ if (qemu_opt_get(opts, "align") != NULL) {
+ error_setg(errp, "Please specify shift option when using align");
+ }
return;
}
-
+ icount_align_option = qemu_opt_get_bool(opts, "align", false);
icount_warp_timer = timer_new_ns(QEMU_CLOCK_REALTIME,
icount_warp_rt, NULL);
if (strcmp(option, "auto") != 0) {
- icount_time_shift = strtol(option, NULL, 0);
+ errno = 0;
+ icount_time_shift = strtol(option, &rem_str, 0);
+ if (errno != 0 || *rem_str != '\0' || !strlen(option)) {
+ error_setg(errp, "icount: Invalid shift value");
+ }
use_icount = 1;
return;
+ } else if (icount_align_option) {
+ error_setg(errp, "shift=auto and align=on are incompatible");
}
use_icount = 2;
@@ -1250,7 +1315,8 @@ static int tcg_cpu_exec(CPUArchState *env)
int64_t count;
int64_t deadline;
int decr;
- qemu_icount -= (cpu->icount_decr.u16.low + cpu->icount_extra);
+ timers_state.qemu_icount -= (cpu->icount_decr.u16.low
+ + cpu->icount_extra);
cpu->icount_decr.u16.low = 0;
cpu->icount_extra = 0;
deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL);
@@ -1265,7 +1331,7 @@ static int tcg_cpu_exec(CPUArchState *env)
}
count = qemu_icount_round(deadline);
- qemu_icount += count;
+ timers_state.qemu_icount += count;
decr = (count > 0xffff) ? 0xffff : count;
count -= decr;
cpu->icount_decr.u16.low = decr;
@@ -1278,7 +1344,8 @@ static int tcg_cpu_exec(CPUArchState *env)
if (use_icount) {
/* Fold pending instructions back into the
instruction counter, and clear the interrupt flag. */
- qemu_icount -= (cpu->icount_decr.u16.low + cpu->icount_extra);
+ timers_state.qemu_icount -= (cpu->icount_decr.u16.low
+ + cpu->icount_extra);
cpu->icount_decr.u32 = 0;
cpu->icount_extra = 0;
}
@@ -1487,3 +1554,20 @@ void qmp_inject_nmi(Error **errp)
error_set(errp, QERR_UNSUPPORTED);
#endif
}
+
+void dump_drift_info(FILE *f, fprintf_function cpu_fprintf)
+{
+ if (!use_icount) {
+ return;
+ }
+
+ cpu_fprintf(f, "Host - Guest clock %"PRIi64" ms\n",
+ (cpu_get_clock() - cpu_get_icount())/SCALE_MS);
+ if (icount_align_option) {
+ cpu_fprintf(f, "Max guest delay %"PRIi64" ms\n", -max_delay/SCALE_MS);
+ cpu_fprintf(f, "Max guest advance %"PRIi64" ms\n", max_advance/SCALE_MS);
+ } else {
+ cpu_fprintf(f, "Max guest delay NA\n");
+ cpu_fprintf(f, "Max guest advance NA\n");
+ }
+}
diff --git a/include/qemu-common.h b/include/qemu-common.h
index 6ef8282234..bcf7a6ad43 100644
--- a/include/qemu-common.h
+++ b/include/qemu-common.h
@@ -41,6 +41,7 @@
#include <assert.h>
#include <signal.h>
#include "glib-compat.h"
+#include "qemu/option.h"
#ifdef _WIN32
#include "sysemu/os-win32.h"
@@ -105,8 +106,13 @@ static inline char *realpath(const char *path, char *resolved_path)
#endif
/* icount */
-void configure_icount(const char *option);
+void configure_icount(QemuOpts *opts, Error **errp);
extern int use_icount;
+extern int icount_align_option;
+/* drift information for info jit command */
+extern int64_t max_delay;
+extern int64_t max_advance;
+void dump_drift_info(FILE *f, fprintf_function cpu_fprintf);
#include "qemu/osdep.h"
#include "qemu/bswap.h"
diff --git a/include/qemu/timer.h b/include/qemu/timer.h
index 7f9a074c2a..5f5210d543 100644
--- a/include/qemu/timer.h
+++ b/include/qemu/timer.h
@@ -745,6 +745,8 @@ static inline int64_t get_clock(void)
/* icount */
int64_t cpu_get_icount(void);
int64_t cpu_get_clock(void);
+int64_t cpu_get_clock_offset(void);
+int64_t cpu_icount_to_ns(int64_t icount);
/*******************************************/
/* host CPU ticks (if available) */
diff --git a/include/sysemu/char.h b/include/sysemu/char.h
index 0bbd631e72..98cd4c958e 100644
--- a/include/sysemu/char.h
+++ b/include/sysemu/char.h
@@ -358,6 +358,9 @@ CharDriverState *qemu_char_get_next_serial(void);
/* msmouse */
CharDriverState *qemu_chr_open_msmouse(void);
+/* testdev.c */
+CharDriverState *chr_testdev_init(void);
+
/* baum.c */
CharDriverState *chr_baum_init(void);
diff --git a/monitor.c b/monitor.c
index 5bc70a642d..cdbaa60f98 100644
--- a/monitor.c
+++ b/monitor.c
@@ -1047,6 +1047,7 @@ static void do_info_registers(Monitor *mon, const QDict *qdict)
static void do_info_jit(Monitor *mon, const QDict *qdict)
{
dump_exec_info((FILE *)mon, monitor_fprintf);
+ dump_drift_info((FILE *)mon, monitor_fprintf);
}
static void do_info_history(Monitor *mon, const QDict *qdict)
diff --git a/qapi-schema.json b/qapi-schema.json
index b11aad2068..341f417a5f 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -2749,7 +2749,7 @@
#
# Configuration info for the new chardev backend.
#
-# Since: 1.4
+# Since: 1.4 (testdev since 2.2)
##
{ 'type': 'ChardevDummy', 'data': { } }
@@ -2764,6 +2764,7 @@
'mux' : 'ChardevMux',
'msmouse': 'ChardevDummy',
'braille': 'ChardevDummy',
+ 'testdev': 'ChardevDummy',
'stdio' : 'ChardevStdio',
'console': 'ChardevDummy',
'spicevmc' : 'ChardevSpiceChannel',
diff --git a/qemu-char.c b/qemu-char.c
index 956be49ecd..6964a2d9fd 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -3256,6 +3256,7 @@ QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename)
strcmp(filename, "pty") == 0 ||
strcmp(filename, "msmouse") == 0 ||
strcmp(filename, "braille") == 0 ||
+ strcmp(filename, "testdev") == 0 ||
strcmp(filename, "stdio") == 0) {
qemu_opt_set(opts, "backend", filename);
return opts;
@@ -4057,6 +4058,9 @@ ChardevReturn *qmp_chardev_add(const char *id, ChardevBackend *backend,
chr = chr_baum_init();
break;
#endif
+ case CHARDEV_BACKEND_KIND_TESTDEV:
+ chr = chr_testdev_init();
+ break;
case CHARDEV_BACKEND_KIND_STDIO:
chr = qemu_chr_open_stdio(backend->stdio);
break;
diff --git a/qemu-options.hx b/qemu-options.hx
index 154962558b..96516c1e23 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -3011,11 +3011,11 @@ re-inject them.
ETEXI
DEF("icount", HAS_ARG, QEMU_OPTION_icount, \
- "-icount [N|auto]\n" \
+ "-icount [shift=N|auto][,align=on|off]\n" \
" enable virtual instruction counter with 2^N clock ticks per\n" \
- " instruction\n", QEMU_ARCH_ALL)
+ " instruction and enable aligning the host and virtual clocks\n", QEMU_ARCH_ALL)
STEXI
-@item -icount [@var{N}|auto]
+@item -icount [shift=@var{N}|auto]
@findex -icount
Enable virtual instruction counter. The virtual cpu will execute one
instruction every 2^@var{N} ns of virtual time. If @code{auto} is specified
@@ -3026,6 +3026,17 @@ Note that while this option can give deterministic behavior, it does not
provide cycle accurate emulation. Modern CPUs contain superscalar out of
order cores with complex cache hierarchies. The number of instructions
executed often has little or no correlation with actual performance.
+
+@option{align=on} will activate the delay algorithm which will try to
+to synchronise the host clock and the virtual clock. The goal is to
+have a guest running at the real frequency imposed by the shift option.
+Whenever the guest clock is behind the host clock and if
+@option{align=on} is specified then we print a messsage to the user
+to inform about the delay.
+Currently this option does not work when @option{shift} is @code{auto}.
+Note: The sync algorithm will work for those shift values for which
+the guest clock runs ahead of the host clock. Typically this happens
+when the shift value is high (how high depends on the host machine).
ETEXI
DEF("watchdog", HAS_ARG, QEMU_OPTION_watchdog, \
diff --git a/qtest.c b/qtest.c
index 04a6dc1f0f..ef0d99191c 100644
--- a/qtest.c
+++ b/qtest.c
@@ -19,6 +19,9 @@
#include "hw/irq.h"
#include "sysemu/sysemu.h"
#include "sysemu/cpus.h"
+#include "qemu/config-file.h"
+#include "qemu/option.h"
+#include "qemu/error-report.h"
#define MAX_IRQ 256
@@ -509,10 +512,16 @@ static void qtest_event(void *opaque, int event)
}
}
-int qtest_init_accel(MachineClass *mc)
+static void configure_qtest_icount(const char *options)
{
- configure_icount("0");
+ QemuOpts *opts = qemu_opts_parse(qemu_find_opts("icount"), options, 1);
+ configure_icount(opts, &error_abort);
+ qemu_opts_del(opts);
+}
+int qtest_init_accel(MachineClass *mc)
+{
+ configure_qtest_icount("0");
return 0;
}
diff --git a/stubs/Makefile.objs b/stubs/Makefile.objs
index 528e1617b3..5e347d04bd 100644
--- a/stubs/Makefile.objs
+++ b/stubs/Makefile.objs
@@ -2,6 +2,7 @@ stub-obj-y += arch-query-cpu-def.o
stub-obj-y += bdrv-commit-all.o
stub-obj-y += chr-baum-init.o
stub-obj-y += chr-msmouse.o
+stub-obj-y += chr-testdev.o
stub-obj-y += clock-warp.o
stub-obj-y += cpu-get-clock.o
stub-obj-y += cpu-get-icount.o
diff --git a/stubs/chr-testdev.c b/stubs/chr-testdev.c
new file mode 100644
index 0000000000..23112a2c07
--- /dev/null
+++ b/stubs/chr-testdev.c
@@ -0,0 +1,7 @@
+#include "qemu-common.h"
+#include "sysemu/char.h"
+
+CharDriverState *chr_testdev_init(void)
+{
+ return 0;
+}
diff --git a/target-mips/op_helper.c b/target-mips/op_helper.c
index 27651a4a00..df97b35f87 100644
--- a/target-mips/op_helper.c
+++ b/target-mips/op_helper.c
@@ -21,6 +21,7 @@
#include "qemu/host-utils.h"
#include "exec/helper-proto.h"
#include "exec/cpu_ldst.h"
+#include "sysemu/kvm.h"
#ifndef CONFIG_USER_ONLY
static inline void cpu_mips_tlb_flush (CPUMIPSState *env, int flush_global);
@@ -2168,6 +2169,16 @@ void mips_cpu_unassigned_access(CPUState *cs, hwaddr addr,
MIPSCPU *cpu = MIPS_CPU(cs);
CPUMIPSState *env = &cpu->env;
+ /*
+ * Raising an exception with KVM enabled will crash because it won't be from
+ * the main execution loop so the longjmp won't have a matching setjmp.
+ * Until we can trigger a bus error exception through KVM lets just ignore
+ * the access.
+ */
+ if (kvm_enabled()) {
+ return;
+ }
+
if (is_exec) {
helper_raise_exception(env, EXCP_IBE);
} else {
diff --git a/vl.c b/vl.c
index fe451aaf15..a8029d59d7 100644
--- a/vl.c
+++ b/vl.c
@@ -183,6 +183,7 @@ uint8_t *boot_splash_filedata;
size_t boot_splash_filedata_size;
uint8_t qemu_extra_params_fw[2];
+int icount_align_option;
typedef struct FWBootEntry FWBootEntry;
struct FWBootEntry {
@@ -537,6 +538,23 @@ static QemuOptsList qemu_mem_opts = {
},
};
+static QemuOptsList qemu_icount_opts = {
+ .name = "icount",
+ .implied_opt_name = "shift",
+ .merge_lists = true,
+ .head = QTAILQ_HEAD_INITIALIZER(qemu_icount_opts.head),
+ .desc = {
+ {
+ .name = "shift",
+ .type = QEMU_OPT_STRING,
+ }, {
+ .name = "align",
+ .type = QEMU_OPT_BOOL,
+ },
+ { /* end of list */ }
+ },
+};
+
/**
* Get machine options
*
@@ -2908,13 +2926,12 @@ int main(int argc, char **argv, char **envp)
{
int i;
int snapshot, linux_boot;
- const char *icount_option = NULL;
const char *initrd_filename;
const char *kernel_filename, *kernel_cmdline;
const char *boot_order;
DisplayState *ds;
int cyls, heads, secs, translation;
- QemuOpts *hda_opts = NULL, *opts, *machine_opts;
+ QemuOpts *hda_opts = NULL, *opts, *machine_opts, *icount_opts = NULL;
QemuOptsList *olist;
int optind;
const char *optarg;
@@ -2979,6 +2996,7 @@ int main(int argc, char **argv, char **envp)
qemu_add_opts(&qemu_msg_opts);
qemu_add_opts(&qemu_name_opts);
qemu_add_opts(&qemu_numa_opts);
+ qemu_add_opts(&qemu_icount_opts);
runstate_init();
@@ -3830,7 +3848,11 @@ int main(int argc, char **argv, char **envp)
}
break;
case QEMU_OPTION_icount:
- icount_option = optarg;
+ icount_opts = qemu_opts_parse(qemu_find_opts("icount"),
+ optarg, 1);
+ if (!icount_opts) {
+ exit(1);
+ }
break;
case QEMU_OPTION_incoming:
incoming = optarg;
@@ -4306,11 +4328,14 @@ int main(int argc, char **argv, char **envp)
qemu_spice_init();
#endif
- if (icount_option && (kvm_enabled() || xen_enabled())) {
- fprintf(stderr, "-icount is not allowed with kvm or xen\n");
- exit(1);
+ if (icount_opts) {
+ if (kvm_enabled() || xen_enabled()) {
+ fprintf(stderr, "-icount is not allowed with kvm or xen\n");
+ exit(1);
+ }
+ configure_icount(icount_opts, &error_abort);
+ qemu_opts_del(icount_opts);
}
- configure_icount(icount_option);
/* clean up network at qemu process termination */
atexit(&net_cleanup);